Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/5927#issuecomment-99697229
This seems fine to me. If we were to design this all over again, I'd
consider just dropping the `withIndex` methods in favor of either a
`withContext` method or just requiring users to use `TaskContext.get`. Since
we already have `mapPartitionsWithIndex`, though, I suppose it's fine to add
this for completeness. Note that I wouldn't recommend that we add `*WithIndex`
variants for most methods, but I think that `mapPartitions` and
`foreachPartition` are somewhat low-level special cases compared to most RDD
operations.
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